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DATE

Thursday, May 14, 2026 at 8:30 a.m. ET

CALL PARTICIPANTS

  • Chief Executive Officer — Simon Irish
  • Chief Financial Officer — Brian Thrasher
  • Operator

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TAKEAWAYS

  • Cash and Cash Investments -- $289.9 million at quarter end, down from $297.8 million at the end of 2025.
  • Cash Burn -- $7.9 million for the quarter, increasing by $1.8 million sequentially due to $600,000 for 2025 discretionary bonuses and a $1 million paydown of vendor accounts payable, with the remaining $200,000 attributed to higher R&D payments.
  • Operating Expenses -- Research and development expenses rose $1 million sequentially, mainly from fuel development and graphite testing; general and administrative expenses increased $4.6 million, driven by higher headcount and stock-based compensation as the company builds its public company team.
  • Capital Structure -- Share count increased by approximately 100,000 due to stock option exercises; no debt, with modest current liabilities and lease obligations.
  • Regulatory Milestone -- Subsequent to quarter end, the NRC approved the IMSR Postulated Initiating Events Topical Report via a Safety Evaluation Report, establishing methodology for IMSR safety analysis and forming part of the licensing basis for future applications.
  • Commercial Pipeline -- The pipeline includes about 10 IMSR Plant projects, now incorporating a new MOU with Riot Platforms for co-located nuclear plants serving data centers, bringing aggregated indicative power capacity to 7.8 gigawatts.
  • Fuel Strategy -- IMSR exclusively uses standard nuclear fuel (LEU, less than 5% U-235), explicitly avoiding the HALEU supply challenges faced by other Generation IV reactors, positioning the company with simpler supply logistics and regulatory oversight.
  • Supply Chain Execution -- Supplier relationships for component fabrication and fuel infrastructure advanced, with the supplier group expanded to execute on Projects TETRA and TEFLA.
  • Project Development -- The company completed an OTA contract with the DOE covering Project TETRA (test reactor assembly) and Project TEFLA (fuel line assembly) to support engineering, regulatory, and infrastructure progress for IMSR plants.
  • Guidance -- Management reiterated its plan to announce one to three additional project partnership or site disclosures by year end, consistent with guidance issued in March.

SUMMARY

Terrestrial Energy Inc. reported sequentially higher cash burn, a detailed update on elevated R&D and G&A spending, and affirmed a cash position of $289.9 million. New regulatory progress was announced, as the NRC approved the IMSR Postulated Initiating Events Topical Report, providing a more streamlined licensing pathway. The commercial pipeline expanded after signing an MOU with Riot Platforms, introducing opportunities for IMSR plant deployments targeting the data center industry and increasing indicative power capacity to 7.8 gigawatts. No debt was reported, and supply chain execution accelerated with new supplier partnerships, further securing progress on engineering and fuel supply projects.

  • CEO Irish said, "Companies that choose HALEU fuel for advanced reactors now face a considerable fuel supply timeline and infrastructure cost challenge, which we have resolved more than a decade ago."
  • CFO Thrasher said, "We expect cash burn to increase throughout 2026 as we scale our organization and resources, material testing and qualification, supplier selection activities and project-related work."
  • Management confirmed the IMSR system’s fuel design "could very, very comfortably accommodate all these other nuclear fuels," referring to LEU+, spent fuel, plutonium, and thorium, but stressed commercial focus remains on standard-assay LEU for cost efficiency.
  • The NRC approval of the PIE Topical Report allows "repeated use of agreed safety frameworks for licensing of multiple IMSR plants," supporting future fleet deployments.

INDUSTRY GLOSSARY

  • IMSR: Integral Molten Salt Reactor, Terrestrial Energy’s proprietary small modular nuclear reactor design using liquid fuel salts.
  • HALEU: High-Assay Low-Enriched Uranium, nuclear fuel with enrichment between 5%-20% U-235.
  • LEU: Low-Enriched Uranium, nuclear fuel with enrichment less than 5% U-235.
  • OTA Contract: Other Transaction Authority agreement, a flexible contracting mechanism used by the U.S. Department of Energy for technology development.
  • PIE Topical Report: Postulated Initiating Events Topical Report, a regulatory submission analyzing potential initiating events in nuclear plant safety.
  • NRG Petten: A leading nuclear research facility in the Netherlands performing materials testing for reactor qualification.
  • MOU: Memorandum of Understanding, a non-binding agreement that outlines intentions for partnership or project development.

Full Conference Call Transcript

Simon Irish: Thank you, Tyler, and good morning, everyone. When we last spoke in March, we outlined a 3-pillar framework for assessing our progress and our commitment to disciplined execution against clear milestones. Today, I will report on first quarter progress against that framework, and Brian then will discuss our financial results. Before I turn to first quarter developments, let me briefly affirm the context in which we are operating. The generational shift in energy demand and policy that we described at year-end has only intensified in the month since. It is secular, long term and compelling. Electricity demand expectations continue to rise, driven by AI infrastructure, the reshoring of manufacturing capacity and broader electrification.

Energy security is again a dominant policy theme across advanced economies. Against this market backdrop, the IMSR plant is powerfully and competitively differentiated. Let me briefly remind you of just 2 of those differentiators. First, size, affordability and capital efficiency. At 1/6 the size of a conventional nuclear plant, the IMSR plant is right-sized for the growth market opportunity today. Its steam turbines operate at near 50% greater efficiency than those driven by a light water reactor. Its nuclear systems operate at low pressure and with high inherent safety. All are powerful competitive economic virtues that increase affordability and financeability, reduce risk and secure strong social license for deployment.

Second, our fuel strategy, and I want to spend a few moments on this point. The IMSR plant uses standard nuclear fuel, uranium at standard enrichment, i.e., less than 5% U-235, which has become the world's standard over many decades. This was a strategic choice that we made more than a decade ago, deliberately avoiding HALEU fuel use, i.e., fuel at enrichment levels of between 15% and 20% U-235, the levels required by other Generation IV reactors in the advanced nuclear sector. In today's HALEU enrichment-constrained industry, our decision has removed the considerable challenges, costs and uncertainty of HALEU fuel supply at commercial scale.

It also has the benefit of reducing regulated complexity and cost, both for first plant and for fleet. This is relevant to our competitive positioning and to how we believe the market should evaluate deployment readiness in our sector. Companies that choose HALEU fuel for advanced reactors now face a considerable fuel supply timeline and infrastructure cost challenge, which we have resolved more than a decade ago. As I described in March, our 3-pillar framework guides how we assess and report progress. The first pillar covers IMSR engineering and regulatory developments, including Project TETRA, our test reactor assembly and Project TEFLA, our fuel line assembly.

The second covers supply chain development and the third covers our commercial pipeline of IMSR plants. Let me walk through first quarter progress for each of these 3. First, our engineering and regulatory pillar. Early in the quarter, we completed OTA contract with the DOE to advance Project TETRA, our test reactor assembly and Project TEFLA, our fuel line assembly. The projects support engineering and regulatory programs for IMSR plant commercial operation and the infrastructure development for IMSR plant fuel supply. Our graphite irradiation testing and supply activities are ongoing at NRG Petten, one of the world's most powerful test reactors. This work is essential for reactor materials qualification, supplier selection and licensing readiness.

Subsequent to quarter end, we achieved another foundational regulatory milestone with the Nuclear Regulatory Commission. We completed final submissions to the NRC supporting our Postulated Initiating Events methodology or PIE, Topical Report, and the NRC has subsequently approved that Topical Report issuing its Safety Evaluation Report. The details are in Tuesday's press release, but let me underscore what this means. The Safety Evaluation Report establishes an important methodology for IMSR safety analysis. It forms part of the future licensing basis of the IMSR plant as it can be referenced in future licensing applications without reevaluation.

The role of Topical Reports with associated Safety Evaluation Reports reduces the scope of subsequent regulatory reviews, improves predictability by resolving key safety analyses early and increases confidence in the licensing pathway to commercial operations. Furthermore, it also enables repeated use of agreed safety frameworks for licensing of multiple IMSR plants, which is important as we look through first plant to establishing deployment efficiencies at fleet-scale. The PIE Safety Evaluation Report follows on from the NRC's 2025 Safety Evaluation Report for the IMSR's principal design criteria. Together, these 2 approved analyses establish foundational elements of the IMSR plant's licensing basis. Our completion of this work reflects the depth and duration of our engineering engagement with the NRC.

Turning to the second pillar, supply chain developments. Our relationships with industry nuclear suppliers remain in active execution, supporting the fabrication of reactor components and the development of fuel supply infrastructure. Over the quarter, we built our supplier group for the execution of projects TETRA and TEFLA. Turning to the third pillar, our commercial pipeline of IMSR Plant projects. Following quarter end, we executed an MOU with Riot Platforms, creating the opportunity for a best-in-class pairing of data center and nuclear plant. The company plans to co-locate IMSR Plants with Riot developed data centers serving AI and high-performance compute applications.

The agreement covers multiple project opportunities across the U.S. and the use of natural gas as a bridge fuel to accelerate commercial power supply and enhance resilience during full plant operation. This relationship establishes a hyperscale data center commercial channel for IMSR Plants. It further underscores the demand side value of the IMSR Plant design and our business model. And it reflects exactly the kind of high-value industrial application the IMSR Plant is designed to serve. Our commercial pipeline consists of approximately 10 IMSR Plant projects. With the Riot relationship, this pipeline represents 7.8 gigawatts of indicative power capacity. The IMSR Plant's combination of affordability, capital efficiency, siting flexibility, customized supply make it well suited to the growth opportunity today.

Over the quarter, we executed against clearly defined milestones, advancing across all 3 pillars of our business plan, always looking past the deployment of a single IMSR Plant to a fleet operating in the 2030s. With that, I will now turn the call over to Brian Thrasher, our Chief Financial Officer, to review our financial results.

Brian Thrasher: Thank you, Simon, and good morning, everyone. First quarter results indicate a clean balance sheet, disciplined cash management and continued investment in the engineering process and resources for commercial execution. Please note that year-over-year comparisons are unlikely to be informative this quarter given the transformations in the business in 2025. We're presenting results on a sequential quarter basis, which we believe to be a more relevant indicator of company performance. At quarter end, we held total cash and cash investments of $289.9 million. This compares to $297.8 million at year-end 2025. Cash burn for the quarter was $7.9 million, an increase of $1.8 million compared to the prior quarter after consideration of one-time transaction costs associated with the 2025 merger.

Two items drove the majority of this increase. First, a first quarter 2026 payment of $600,000 for 2025 discretionary bonuses; and second, $1 million paydown of accounts payable for vendors offering extended credit terms. The remaining $200,000 increase of first quarter cash burn is attributable to higher sequential payments for research and development costs. We expect cash burn to increase throughout 2026 as we scale our organization and resources, material testing and qualification, supplier selection activities and project-related work. This is the continuation of the ramp we began in fourth quarter last year following the completion of the merger transaction. I'll now turn to operating expenses.

Research and development expenses were up $1 million sequentially, driven by our fuel development and graphite testing programs. General and administrative expenses were up $4.6 million sequentially, primarily reflecting headcount and stock-based compensation as we build out the public company team. The fourth quarter of 2025 also included a credit of approximately $2.7 million from legal and accounting expenses that were capitalized in conjunction with the merger accounting. Turning to our capitalization table. Issued and outstanding shares were up modestly approximately 100,000 shares from stock option exercises during the quarter. Share count is effectively unchanged from year-end 2025. In summary, our balance sheet is straightforward, clean and tight.

Cash and short-term investments make up the vast majority of our assets, liabilities are limited. We have modest current liabilities and lease obligations and no debt. The company continues to hold a strong capital position to execute against the milestones Simon has outlined. That concludes our prepared remarks. Operator, please open the line for questions.

Operator: [Operator Instructions] Our first question is from Derek Soderberg with Cantor Fitzgerald.

Derek Soderberg: So Simon, I appreciate the color on the SALEU and HALEU dynamic. That distinction certainly makes sense as a differentiator to other Gen 4 reactors at the feedstock level. So the next step is taking that and deconverting it and fabricating it into molten salt, right? So I'm curious if you can walk us through the TEFLA pilot plant timeline, when you expect commercial scale fuel production there to be online maybe relative to the first plant deployment? And then sort of on top of that, is fuel fabrication sort of the binding constraint to the deployment schedule here?

Simon Irish: Yes. Derek, thanks for the question. Good question. So in terms of our fuel -- entire fuel supply program, we have been providing, sort of, more detail on exactly how we're going to achieve fleet level supply of HALEU fuel. The end reactor feed is IMSR fuel salts. HALEU is the enriched material that comes out of enrichment plant. It's the first link of the supply chain. The reason we emphasize that, the HALEU and simply talk about HALEU to the degree that we do at the moment is because without it, there's no supply chain because it's the first link. So HALEU is extremely important.

We have in our Westinghouse, last Westinghouse press release indicated what the next link is, which is to your point about deconversion. The next link is deconverting to the chemical form we need, which is uranium tetrafluoride. -- and deconversion and conversion from uranium into fluoride is very much -- that chemistry is very much part of the whole nuclear supply chain. The deconversion that we need, though, from hex, which comes out in the enrichment plant, is the deconversion of uranium of enriched uranium at that fluoride level. So we need to -- the end product, the chemical form is uranium tetrafluoride. The physical form for reactor feed is IMSR fuel salt.

So there are additional steps to come up with the physical form. But keep one point, Derek, on the physical form. The physical form is not this extraordinary detailed reactor assembly, which is nuclear fuel as we've known it today, that's fuel bundle. The form that -- we don't have a physical form in that context. So manufacturing is simply a chemical production process to create a final fuel form, which is the IMSR fuel salt, which is in a fluoride -- it's a fluoride chemistry, it's a fluoride form to the precise requirements from a purity perspective to make it licensed reactor feed for a licensed plant. So there are additional steps.

Those additional steps are the steps that we will be developing in Project TEFLA at the pilot level. And this is why Project TEFLA is important and so important to one of the key elements of our business plan. We're not looking to build and operate. But nonetheless, we are looking to be principal in fuel supply. and to be principal in IMSR core unit supply as well.

So with respect to how we go about as a business, establishing ourselves as a principal in fuel supply production, that final step of the process where we think there's an opportunity for us to add considerable value, particularly from an IP perspective, that final step of the process is Project TEFLA plays a very big role in us perfecting and industrializing the processes that will need to be put in place to create that final fuel form, which is the IMSR fuel salt, the final reactor feed that goes into the reactor.

Derek Soderberg: Got it. Really appreciate the color on that. And then with the PIE Topical Report approved by the NRC, what sort of are the next regulatory submissions we should be watching out for as you guys prepare for the formal site licensing and construction?

Simon Irish: Well, thanks, Derek. So in terms of regulatory preparedness, I would say there are 2 great branches of this for anyone in the market today. The first one is preparing for operating license because making the case that your nuclear systems are compliant with nuclear safety standards. And the other great branch is the construction permit where you have the opportunity to sign off on all the large environmental requirements and start the process of constructing the plant. So the -- I think the -- everyone in our space is working on both construction permits, pay a lot of attention construction permits. But they didn't say much at all about the safety of nuclear systems.

The safety of nuclear systems is associated with your preparedness to submit an operating license. And that preparedness can be established clearly from a milestone perspective with how you're getting on with your -- with the Topical Report submissions because a Topical Report submission allows you to discharge an element of safety analysis that will ultimately go into that final operating license. So we're pleased to report in 2025 and pleased to report very recently the progress we're making with submitting Topical Reports to the NRC, engaging with staff and the NRC on a timely basis responding with the issuance of the approval of the Topical Report and the issuance of the Safety Evaluation Report.

And it's those elements, Topical Reports with the safety analysis has been approved, that approved methodology, which is valuable and puts you in an increasingly confident position to submit the operating license. And it's the operating license that allows you to operate a nuclear plant for a commercial purpose. The construction permit just allows you to move your EPC guys onto the site. It's the operating license that is the end game.

Operator: Our next question is from George Gianarikas with Canaccord Genuity.

George Gianarikas: I'd like to continue on the fuel thread. Have you explored the use of LEU+ in your reactor design?

Simon Irish: Yes. We -- I mean, this is going back a bit, George, when we sort of made our decision 10 years ago to use standard nuclear fuel. LEU+ could potentially have some technical benefits that may manifest in commercial benefits as well. If it becomes readily available and easily available, we will look at this quite carefully. But our analysis would be that from a commercial perspective, it would be, I think, sort of quite a marginal development. But definitely, we'll look at it if it becomes broadly available.

George Gianarikas: And the design is flexible enough such that I would assume that you could feed it into the reactor.

Simon Irish: Yes. I mean, George, from a design perspective, our design, you could view us as the diesel engine of nuclear reactor systems. It can take a massive array of fuel without that long and extremely expensive regulatory requirement, which is qualifying a physical fuel form. We don't use a physical fuel. We use liquid fuel. So at the one end, you can very easily and comfortably use LEU enriched to no more than 5%, which we are at the moment, and that's a very secure place to start.

But at the other end, we could be, if market circumstances and policy circumstances dictate, we could be very active in using spent nuclear fuel, plutonium, thorium and all these other exotic fuels that are floating around. We are -- our system could very, very comfortably accommodate all these other nuclear fuels. The reason that we haven't gone there is because we think the problem to solve is not a fuel -- is not sort of to use these funky fuels. We think the problem to solve is affordability and cost.

So we're keeping it simple at the front end, focused on what matters commercially, which is the affordability of the nuclear plant, is capital efficiency and the cost of power. And so that has driven our -- so far, our commercial focus to just using what we call standard-assay LEU. But we do recognize tremendous potential in using spent nuclear fuel, plutonium, thorium and all the other exotic fuels that are occasionally advocated in the market.

George Gianarikas: And maybe just last question for me. Just your thoughts on Part 57. It appears to be just some inklings of detail there. Any potential leverage you could have in terms of using it to accelerate your pathway?

Simon Irish: Well, yes, I mean, Part 57 is -- I believe that's microreactors, George. Our regulatory team has not forwarded it as a relevant regulatory development for Terrestrial Energy, but I believe it's more focused on microreactors where you have sort of -- is that correct?

George Gianarikas: I think that's right. But I think there are bits related to waste that may be leverageable. Just sort of curious because we're trying to figure out exactly what it means and how leverageable it is to other companies outside the microreactor space.

Simon Irish: Yes, George, I'm happy to go offline and have a discussion on that after sort of consulting with our regulatory team. The one that we are sort of focused on is Part 53 because that is a possibility, a practical possibility of a different licensing pathway for us, both to first plant and also to fleet.

Operator: We now have a follow-up from Derek Soderberg with Cantor Fitzgerald.

Derek Soderberg: Just a couple more. First, regarding the executed OTA agreements with the DOE. Is that going to help you guys at all with capital expenditures for the TETRA and TEFLA programs over the next year or so?

Simon Irish: Well, Derek, I think sort, of perhaps indirectly, because capital likes regulatory clarity to achieve project goals. And that OTA authority, that OTA contract with the Department of Energy provides that regulatory clarity that we need to get TETRA and TEFLA done. So yes, it does help from a capital perspective in that regard.

Derek Soderberg: Got it. Got it. And then my final one, just on your pipeline of 10 projects. I think in the past, you guys have talked about potentially declaring, I think, 1 to 3 additional projects this year, and you've got the Riot MOU now announced. Are you still tracking towards additional site or partner disclosures this year?

Simon Irish: Yes. I mean we reiterate the guidance we issued in March with 1 to 3 additional projects. And obviously, tracking against that is-- it was clearly the Riot announcement from a couple of weeks back.

Operator: With no further questions, I would like to hand the conference back over to Simon for closing remarks.

Simon Irish: Thank you. So, thank you for joining us today and your interest in the company. We set expectations for the year ahead last quarter, and we're pleased with the progress this quarter against that benchmark. The work ahead of us is all about execution. We look forward to demonstrating that milestone by milestone through 2026 and beyond. Thank you.

Operator: Thank you. This will conclude today's conference. You may disconnect your lines at this time, and thank you for your participation.